An historian has unearthed the first unseen Sherlock Holmes story in more than 80 years that Sir Arthur Conan Doyle wrote to help save a town bridge. 

Walter Elliot, 80, found the 1,300-word tale starring the famous detective in a collection of short stories written for a local bazaar. 

The wooden bridge in the Scottish town of Selkirk was destroyed by the great flood of 1902 and locals organised a three-day event to raise funds for a new one in 1904.